Add Signal Strength for all channel types, in Db

[MaxwellDPS]

Is there a way to get the Signal strength in DBZ of a TX? Could this be added to the call json?

[robotastic]

I had been interested in this... I have not found a good way to do Signal to Noise... but it looks like a basic Db could be possible:
https://www.tablix.org/~avian/blog/archives/2015/04/signal_power_in_gnu_radio/

Let me add this to the queue. I also have to revisit how the error measurements in the P25 Decoder is handled. I am grabbing that now, but I am not sure it is being uploaded to OpenMHz correctly. It would be great to report and graph both metrics.

[MaxwellDPS]

@robotastic That will help debugging 110%. Thanks for adding to the que!

[robotastic]

Rough signal strength is available on conventional systems.... let me see if I can add it to all channels